JAVA EE: Java Tutorial : Java overloaded Constructors

Thursday, 26 November 2015

Java Tutorial : Java overloaded Constructors

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Java Tutorial : Java overloaded Constructors

Employee.java

public class Employee
{

    private String name;
    private int age;

    public Employee()
    {
        System.out.println("Inside Employee() constructor");
    }

    public Employee(String name)
    {
        System.out.println("Inside  Employee(String name) constructor");
        this.name = name;
    }

    public Employee(String name, int age)
    {
        System.out.println("Inside  Employee(String name,int age) constructor");
        this.name = name;
        this.age = age;
    }

    public Employee(int age)
    {
        System.out.println("Inside  Employee(int age) constructor");
        this.age = age;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }

}

EmployeeDemoTest.java

public class EmployeeDemoTest
{

    public static void main(String[] args)
    {

        Employee employeeObject1 = new Employee();
        System.out.println("Name : " + employeeObject1.getName());
        System.out.println("Age  : " + employeeObject1.getAge());

        System.out.println("------------------------------------");

        Employee employeeObject2 = new Employee("Dave");
        System.out.println("Name : " + employeeObject2.getName());
        System.out.println("Age  : " + employeeObject2.getAge());

        System.out.println("------------------------------------");

        Employee employeeObject3 = new Employee("John", 45);
        System.out.println("Name : " + employeeObject3.getName());
        System.out.println("Age  : " + employeeObject3.getAge());
        
        System.out.println("------------------------------------");

        Employee employeeObject4 = new Employee(54);
        System.out.println("Name : " + employeeObject4.getName());
        System.out.println("Age  : " + employeeObject4.getAge());

    }

}

Output

Inside Employee() constructor
Name : null
Age  : 0
------------------------------------
Inside  Employee(String name) constructor
Name : Dave
Age  : 0
------------------------------------
Inside  Employee(String name,int age) constructor
Name : John
Age  : 45
------------------------------------
Inside  Employee(int age) constructor
Name : null
Age  : 54